ARM: OMAP2+: PRM: provide generic API for system reset

This patch combines the various prm_warm_reset calls under a common
API prm_reset_system, and adds the SoC specific implementation under
prm_ll_data.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Acked-by: Paul Walmsley <paul@pwsan.com>
Tested-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

13 files changed, 36 insertions, 22 deletions

diff --git a/arch/arm/mach-omap2/am33xx-restart.c b/arch/arm/mach-omap2/am33xx-restart.c
index 728638913cd1..5bace6a45ffb 100644
--- a/arch/arm/mach-omap2/am33xx-restart.c
+++ b/arch/arm/mach-omap2/am33xx-restart.c
@@ -9,8 +9,7 @@
 #include <linux/reboot.h>
 
 #include "common.h"
-#include "prm-regbits-33xx.h"
-#include "prm33xx.h"
+#include "prm.h"
 
 /**
  * am3xx_restart - trigger a software restart of the SoC
@@ -24,5 +23,5 @@ void am33xx_restart(enum reboot_mode mode, const char *cmd)
 {
         /* TODO: Handle mode and cmd if necessary */
 
-        am33xx_prm_global_warm_sw_reset();
+        omap_prm_reset_system();
 }
diff --git a/arch/arm/mach-omap2/omap2-restart.c b/arch/arm/mach-omap2/omap2-restart.c
index 68423e26399d..d937b2e4040b 100644
--- a/arch/arm/mach-omap2/omap2-restart.c
+++ b/arch/arm/mach-omap2/omap2-restart.c
@@ -15,7 +15,7 @@
 
 #include "soc.h"
 #include "common.h"
-#include "prm2xxx.h"
+#include "prm.h"
 
 /*
  * reset_virt_prcm_set_ck, reset_sys_ck: pointers to the virt_prcm_set
@@ -40,8 +40,7 @@ void omap2xxx_restart(enum reboot_mode mode, const char *cmd)
 
         /* XXX Should save the cmd argument for use after the reboot */
 
-        omap2xxx_prm_dpll_reset(); /* never returns */
-        while (1);
+        omap_prm_reset_system();
 }
 
 /**
diff --git a/arch/arm/mach-omap2/omap3-restart.c b/arch/arm/mach-omap2/omap3-restart.c
index 5de2a0c2979d..103a49f68bcb 100644
--- a/arch/arm/mach-omap2/omap3-restart.c
+++ b/arch/arm/mach-omap2/omap3-restart.c
@@ -14,10 +14,8 @@
 #include <linux/init.h>
 #include <linux/reboot.h>
 
-#include "iomap.h"
-#include "common.h"
 #include "control.h"
-#include "prm3xxx.h"
+#include "prm.h"
 
 /* Global address base setup code */
 
@@ -32,6 +30,5 @@
 void omap3xxx_restart(enum reboot_mode mode, const char *cmd)
 {
         omap3_ctrl_write_boot_mode((cmd ? (u8)*cmd : 0));
-        omap3xxx_prm_dpll3_reset(); /* never returns */
-        while (1);
+        omap_prm_reset_system();
 }
diff --git a/arch/arm/mach-omap2/omap4-restart.c b/arch/arm/mach-omap2/omap4-restart.c
index 41dfd7da8170..a99e7f7fb5be 100644
--- a/arch/arm/mach-omap2/omap4-restart.c
+++ b/arch/arm/mach-omap2/omap4-restart.c
@@ -9,7 +9,7 @@
 
 #include <linux/types.h>
 #include <linux/reboot.h>
-#include "prminst44xx.h"
+#include "prm.h"
 
 /**
  * omap44xx_restart - trigger a software restart of the SoC
@@ -22,7 +22,5 @@
 void omap44xx_restart(enum reboot_mode mode, const char *cmd)
 {
         /* XXX Should save 'cmd' into scratchpad for use after reboot */
-        omap4_prminst_global_warm_sw_reset(); /* never returns */
-        while (1)
-                ;
+        omap_prm_reset_system();
 }
diff --git a/arch/arm/mach-omap2/prm.h b/arch/arm/mach-omap2/prm.h
index dd802eec0dec..77752e49d8d4 100644
--- a/arch/arm/mach-omap2/prm.h
+++ b/arch/arm/mach-omap2/prm.h
@@ -144,6 +144,7 @@ struct prm_ll_data {
                                   u16 offset, u16 st_offset);
         int (*is_hardreset_asserted)(u8 shift, u8 part, s16 prm_mod,
                                      u16 offset);
+        void (*reset_system)(void);
 };
 
 extern int prm_register(struct prm_ll_data *pld);
@@ -156,6 +157,7 @@ int omap_prm_is_hardreset_asserted(u8 shift, u8 part, s16 prm_mod, u16 offset);
 extern u32 prm_read_reset_sources(void);
 extern bool prm_was_any_context_lost_old(u8 part, s16 inst, u16 idx);
 extern void prm_clear_context_loss_flags_old(u8 part, s16 inst, u16 idx);
+void omap_prm_reset_system(void);
 
 void omap_prm_reconfigure_io_chain(void);
 
diff --git a/arch/arm/mach-omap2/prm2xxx.c b/arch/arm/mach-omap2/prm2xxx.c
index 54ae55520da6..af0f15278fc2 100644
--- a/arch/arm/mach-omap2/prm2xxx.c
+++ b/arch/arm/mach-omap2/prm2xxx.c
@@ -106,7 +106,7 @@ static int omap2xxx_pwrst_to_common_pwrst(u8 omap2xxx_pwrst)
  * Set the DPLL reset bit, which should reboot the SoC.  This is the
  * recommended way to restart the SoC.  No return value.
  */
-void omap2xxx_prm_dpll_reset(void)
+static void omap2xxx_prm_dpll_reset(void)
 {
         omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, WKUP_MOD,
                                    OMAP2_RM_RSTCTRL);
@@ -215,6 +215,7 @@ static struct prm_ll_data omap2xxx_prm_ll_data = {
         .assert_hardreset = &omap2_prm_assert_hardreset,
         .deassert_hardreset = &omap2_prm_deassert_hardreset,
         .is_hardreset_asserted = &omap2_prm_is_hardreset_asserted,
+        .reset_system = &omap2xxx_prm_dpll_reset,
 };
 
 int __init omap2xxx_prm_init(void)
diff --git a/arch/arm/mach-omap2/prm2xxx.h b/arch/arm/mach-omap2/prm2xxx.h
index d73414139292..1d51643062f7 100644
--- a/arch/arm/mach-omap2/prm2xxx.h
+++ b/arch/arm/mach-omap2/prm2xxx.h
@@ -124,7 +124,6 @@
 extern int omap2xxx_clkdm_sleep(struct clockdomain *clkdm);
 extern int omap2xxx_clkdm_wakeup(struct clockdomain *clkdm);
 
-extern void omap2xxx_prm_dpll_reset(void);
 void omap2xxx_prm_clear_mod_irqs(s16 module, u8 regs, u32 wkst_mask);
 
 extern int __init omap2xxx_prm_init(void);
diff --git a/arch/arm/mach-omap2/prm33xx.c b/arch/arm/mach-omap2/prm33xx.c
index 4a843f7cac02..02f628601b09 100644
--- a/arch/arm/mach-omap2/prm33xx.c
+++ b/arch/arm/mach-omap2/prm33xx.c
@@ -341,7 +341,7 @@ static int am33xx_check_vcvp(void)
  *
  * Immediately reboots the device through warm reset.
  */
-void am33xx_prm_global_warm_sw_reset(void)
+static void am33xx_prm_global_warm_sw_reset(void)
 {
         am33xx_prm_rmw_reg_bits(AM33XX_RST_GLOBAL_WARM_SW_MASK,
                                 AM33XX_RST_GLOBAL_WARM_SW_MASK,
@@ -375,6 +375,7 @@ static struct prm_ll_data am33xx_prm_ll_data = {
         .assert_hardreset               = am33xx_prm_assert_hardreset,
         .deassert_hardreset             = am33xx_prm_deassert_hardreset,
         .is_hardreset_asserted          = am33xx_prm_is_hardreset_asserted,
+        .reset_system                   = am33xx_prm_global_warm_sw_reset,
 };
 
 int __init am33xx_prm_init(void)
diff --git a/arch/arm/mach-omap2/prm33xx.h b/arch/arm/mach-omap2/prm33xx.h
index 937d56e70b3e..98ac41f271da 100644
--- a/arch/arm/mach-omap2/prm33xx.h
+++ b/arch/arm/mach-omap2/prm33xx.h
@@ -118,7 +118,6 @@
 #define AM33XX_PM_CEFUSE_PWRSTST                AM33XX_PRM_REGADDR(AM33XX_PRM_CEFUSE_MOD, 0x0004)
 
 #ifndef __ASSEMBLER__
-extern void am33xx_prm_global_warm_sw_reset(void);
 int am33xx_prm_init(void);
 
 #endif /* ASSEMBLER */
diff --git a/arch/arm/mach-omap2/prm3xxx.c b/arch/arm/mach-omap2/prm3xxx.c
index 9da15e9db6d2..c5e00c6714b1 100644
--- a/arch/arm/mach-omap2/prm3xxx.c
+++ b/arch/arm/mach-omap2/prm3xxx.c
@@ -136,7 +136,7 @@ u32 omap3_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset)
  * recommended way to restart the SoC, considering Errata i520.  No
  * return value.
  */
-void omap3xxx_prm_dpll3_reset(void)
+static void omap3xxx_prm_dpll3_reset(void)
 {
         omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, OMAP3430_GR_MOD,
                                    OMAP2_RM_RSTCTRL);
@@ -663,6 +663,7 @@ static struct prm_ll_data omap3xxx_prm_ll_data = {
         .assert_hardreset = &omap2_prm_assert_hardreset,
         .deassert_hardreset = &omap2_prm_deassert_hardreset,
         .is_hardreset_asserted = &omap2_prm_is_hardreset_asserted,
+        .reset_system = &omap3xxx_prm_dpll3_reset,
 };
 
 int __init omap3xxx_prm_init(void)
diff --git a/arch/arm/mach-omap2/prm3xxx.h b/arch/arm/mach-omap2/prm3xxx.h
index 321568bc0847..cfde3f4a03cc 100644
--- a/arch/arm/mach-omap2/prm3xxx.h
+++ b/arch/arm/mach-omap2/prm3xxx.h
@@ -144,8 +144,6 @@ extern u32 omap3_prm_vcvp_read(u8 offset);
 extern void omap3_prm_vcvp_write(u32 val, u8 offset);
 extern u32 omap3_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset);
 
-extern void omap3xxx_prm_dpll3_reset(void);
-
 extern int __init omap3xxx_prm_init(void);
 extern u32 omap3xxx_prm_get_reset_sources(void);
 int omap3xxx_prm_clear_mod_irqs(s16 module, u8 regs, u32 ignore_bits);
diff --git a/arch/arm/mach-omap2/prm44xx.c b/arch/arm/mach-omap2/prm44xx.c
index e7ac7e209edc..cc170fb81ff7 100644
--- a/arch/arm/mach-omap2/prm44xx.c
+++ b/arch/arm/mach-omap2/prm44xx.c
@@ -697,6 +697,7 @@ static struct prm_ll_data omap44xx_prm_ll_data = {
         .assert_hardreset       = omap4_prminst_assert_hardreset,
         .deassert_hardreset     = omap4_prminst_deassert_hardreset,
         .is_hardreset_asserted  = omap4_prminst_is_hardreset_asserted,
+        .reset_system           = omap4_prminst_global_warm_sw_reset,
 };
 
 int __init omap44xx_prm_init(void)
diff --git a/arch/arm/mach-omap2/prm_common.c b/arch/arm/mach-omap2/prm_common.c
index be40824acf5f..779940cb6e56 100644
--- a/arch/arm/mach-omap2/prm_common.c
+++ b/arch/arm/mach-omap2/prm_common.c
@@ -503,6 +503,25 @@ void omap_prm_reconfigure_io_chain(void)
 }
 
 /**
+ * omap_prm_reset_system - trigger global SW reset
+ *
+ * Triggers SoC specific global warm reset to reboot the device.
+ */
+void omap_prm_reset_system(void)
+{
+        if (!prm_ll_data->reset_system) {
+                WARN_ONCE(1, "prm: %s: no mapping function defined\n",
+                          __func__);
+                return;
+        }
+
+        prm_ll_data->reset_system();
+
+        while (1)
+                cpu_relax();
+}
+
+/**
  * prm_register - register per-SoC low-level data with the PRM
  * @pld: low-level per-SoC OMAP PRM data & function pointers to register
  *